1. Marry a rich man, or one who at least has a little extra money.
2. Work in a bank and skim money wherever you can.
3. Teach a pet monkey how to write like Shakespeare.
Seriously, living an upper-class lifestyle means nothing if you're not happy. I know a few wealthy people that live horrible lives, and then again, I know a few poor people that live excellent lives.
All in all, I only know a few people.
My suggestion, find something that you love to do and then do it. Take time to really examine your life, your core values, your morals, and then find a lifestyle that suits you. It could be as big as changing careers or just changing the way you look.
There's a great book that I'll recommend here; it's called, "What Color is Your Parachute", by Dick Bolles. Most libraries have it, or you can look at their website: www.jobhuntersbible.com
The book will really help you discover who you are, and what you want out of life. It's designed as a career book, but I think it does more than that..
Either way, quit worrying about living a high-class life, and worry more about simply enjoying life.